Comment 3 for bug 1785096

I tested an upgrade from Ubuntu 16.04 to Ubuntu 18.04 today using the dist-upgrader from -proposed (manually downloaded and extracted b/c you can't use do-release -p and -d) before the upgrade I had installed an updated version of snapd so /var/cache/apt/archives was 14 MB. After the upgrade it was still 14 MB indicating that the debs downloaded for the upgrade had been removed from disk.

bdmurray@clean-xenial-amd64:~/u-r-u$ du -sh /var/cache/apt/archives
du: cannot read directory '/var/cache/apt/archives/partial': Permission denied
14M /var/cache/apt/archives
bdmurray@clean-xenial-amd64:~/u-r-u$ ls -lh /var/cache/apt/archives/
total 14M
-rw-r----- 1 root root 0 Jul 19 2016 lock
drwx------ 2 _apt root 4.0K Aug 6 11:22 partial
-rw-r--r-- 1 root root 1.7K Jul 19 03:58 snap-confine_2.34.2_amd64.deb
-rw-r--r-- 1 root root 14M Jul 19 03:58 snapd_2.34.2_amd64.deb
-rw-r--r-- 1 root root 1.6K Jul 19 03:58 ubuntu-core-launcher_2.34.2_amd64.deb

Setting to verification-done.